diff --git a/src/mermaidAPI.js b/src/mermaidAPI.js
index 2e9ec5f15..a7b9adfc7 100644
--- a/src/mermaidAPI.js
+++ b/src/mermaidAPI.js
@@ -80,9 +80,9 @@ function parse(text) {
   log.debug('Type ' + graphType);
   switch (graphType) {
     case 'gitGraph':
+      gitGraphAst.clear();
       parser = gitGraphParser;
       parser.parser.yy = gitGraphAst;
-      parser.parser.yy.clear();
       break;
     case 'flowchart':
       flowDb.clear();